how to use marquee tag in xhtml

i'm using

<script type="text/javascript" >
    document.write("<marquee scrollamount='5' onMouseOver='this.stop()' onMouseOut='this.start()'><img alt='ibm' src='images/ibm.png' width='100px' height='100%' /><img alt='tcs' src='images/tcs.jpg' width='100px' height='100%' /><img alt='hp' src='images/hp.png' width='100px' height='100%' /><img alt='hcl' src='images/hcl.jpg' width='100px' height='100%' /><img alt='cts' src='images/cts.jpg' width='100px' height='100%' /><img alt='accenture' src='images/Accenture.png' width='100px' height='100%' /></marquee>");
    </script>

for marquee picture in my website, but when i'm checking my webpage into W3 Validator , then i'm getting error on the above code.

element "marquee" undefined
there is no attribute "onMouseOver"
there is no attribute "scrollamount"
there is no attribute "onMouseOut"

Need help to solve the above problem !!

Solution

The problems are explained in your question.

marquee is an old Microsoft thing and it should not be used.
onMouseOver is also not a defined attribute. You could use onmouseover, but rather, use unobtrusive event handlers.
The other issues can be explained by the above.

Some bonus tips...

There are few reasons why you'd use document.write() or the marquee element in this day and age. Both can be achieved using more elegant and powerful means in JavaScript.
img elements width and height attributes should never include px.
If you're using a HTML5 doctype, the type attribute is no longer required on script elements if the script type is text/javascript.